﻿int main()
{	   	  	 	   	 
    int a, n, count = 1;
    long int sn = 0, tn = 0;
    printf("please input a and n\n");
    scanf("%d,%d", &a, &n);
    printf("a=%d,n=%d\n", a, n);
    while (count <= n)
    {	   	  	 	   	 
        tn = tn + a;
        sn = sn + tn;
        a = a * 10;
        ++count;
    }
    printf("a+aa+...=%ld\n", sn);
}	   	  	 	   	 

